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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef2a6c61312c2febcfa1afa93935ba7ca8ebe9b7cf564682c6acc8559c0ad10' 
  AND token = 'MTwKC58NEuu78ydtX9uggQL4rYMbG8d9Zf75gcvi+KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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