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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763b6aeb3dbca2f42ca5a6ec26afa23617393cb6e74f02ade79968e7f749b6e5' 
  AND token = 'u78cAaW08L4rmwdUKXYGzWB7oqICv1dyLTb67YJLHCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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