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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0516140e7c1bbe9645fafc7b4e355c66df931658fbb72792368d9f495acbddfe' 
  AND token = 'vIeLcEPStSmZk8j+ctHFi5D7iTJAOEIKbsqOtHI1/iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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