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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a9466e9f0b50664718eb92fc70995256f23917a93bdcf21f160b2eaa7fe797' 
  AND token = 'PJ6fuPGUkIDW2WIaL/yUok/AhOfGwnunU2p97fT4ErI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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