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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6eaea7fc376cad7a6176ec9b221a4a2db20dfce6b6be931ce963eaa57773e43' 
  AND token = '24T3ipOxtgsnJ/5qzVb7dVa/92M0kQqI1wJ4rX0e0/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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