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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bf3b07669493d98dc5861f79c19346386b99d44cb5e2902b655413a38da6f4' 
  AND token = '0cDFI8mZm10G+is/dXgH8SQPbuAWss1GC8qZSMRi0dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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