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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937d44b4e178acd31aed5d9f73090c3199b571b66f1dd718165e79a0c188d2f5' 
  AND token = 'snoj27BdiS7XvPdenuIbNG8f/cyT3Ubu+JQGhfLGrIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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