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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc23c05af07fe4269b1eb415ccb2c6ed7cba3deb0dd48da858e86eb87003576f' 
  AND token = 'LSI0c+CCYcgcoTJozapYhjXQc38eQysmc58gwdir3WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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