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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df819fa847b5164beb4aaff18daaf8e51ade9f398440c824db522fc0eeacfec0' 
  AND token = 'eLf7KoY5dr3agI0WSnNVyLH98vvy6vXIjyMCJu5x5l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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