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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef95b06a6fe2fbc63b7c4a2e4e3c8ae511b5757f3831c9371eb857521dce443' 
  AND token = '2+jlmEDCQXwqXP1hJrnl6BLKzVRfA36fxX6EuLA5NT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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