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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167529e744f7762d986f676a6028dad9f0d9ca2ad1c9f272f92d5bdf06173dc5' 
  AND token = 'w/aILUcbZvc9cehvI8Ks2kGns1G7OONcB8wbyCVLbgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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