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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e0d44eb5da2493ff6d1d481ce3bd7e32a7ce7831efe2c165cd0ce27b1ffe7e' 
  AND token = 'yzoz4yq2qOKhO67z6xUFrzPqTc+HH3v+HTEGRuR4DNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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