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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bb284a960ea1aa6d15b9cccd1d8a554d0e535f4306381cff0ecc09f941ab57' 
  AND token = 'I/2L2/I3Ir2ZlA0IPco8/GBf61qw3A1pWvFu+83loz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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