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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cd04ab2c5aecd62bf956bed7d4d171d4f963b38fc3d096cb91d4143d5e4fb7' 
  AND token = 'nbIIMX8AFYBqH5Pk6n9PW930067HFDMlPJVKiCotpj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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