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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa3cdc69cebc7e1daf5b10d4ce51c5d0e29764522702906f8ce3adc9c9f753b' 
  AND token = 'cJ6X03fPUCax0gEtCm2RukgzNZP4Ul0BsFs/Ead53dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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