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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5353439cd34dc7719bc92577f46de3bbb73e130da174d1f7ba7a1d96bec87f1' 
  AND token = 'sFr8tNju4i88GDtGzE1N/0NevDcwSetwX1HnfJXYZt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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