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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea119e48c7bd7d9fbd87e619e89fff27e9d98724343fc42ed81524e73ae2537' 
  AND token = 'WrlWHLiFuZpLftjAFOa9prLOd4/rcsR8DKuk2liXphU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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