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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b9c0b0ec3f64d6b0b8b8e5ce4ac32d0253c9949d7209e5ec4d4b0a0ce2c5cd' 
  AND token = 'Q8SImnZEkvEiAqH7FLs8pOxeRTQIeqo98i1mBeYRhbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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