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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e804c6659ee97aa09a1939784f5a832bce1b61975c8f0030f00c98e1200eb543' 
  AND token = 'co6aTkyO9PaznAu2VpAf7Kpol8IaN8q1m5dHbalzCZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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