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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5d160fadd8d55e98e419f93dbaac7850e4058bb431af2f15b18f9f18f2ad80' 
  AND token = 'gWoe0RH0VpBBlvp8M6olIt1H/3fz0mBLPyGnNAWtQlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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