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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3419ec6fab9e9343dc4087139a5a83477f9f5ae2c91b29f4621b5b233878d57d' 
  AND token = 'Q3F15CyqBKy8CxPnn3atD4M0maFAyiS3Me+rp0463EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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