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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2920ca6dfb5c06f8749877151c439a303c6fac480335d987741fdf60a2b86f35' 
  AND token = 'Cm6vJFyQpocdSWbZ3CN5u1wE/Wq9EB4MizAOrtREgUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}