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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a499b931e0585800eecada1c45c9cac8acd2805e0495272047bdde0d4c01aeee' 
  AND token = '1cRMHR76xeEOeuf2jCG6Helxo+v/A0Yn1VMFTydCw14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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