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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3322d185c217c6f03e82e54ba4ba090c856c0599fec98a513ef53c576a1cb35f' 
  AND token = 'Swaa6+3X6vMQ/PPmNOf5RMtycG14Bv15zfcD/WpqQHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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