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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60f321685f0e667da1c6fcfc0b49b68e3cfa2928ac858252440822364a22ba0' 
  AND token = 'OHkQF5pJpS52cR9c5UnCFSqbr45gB6VHKFayQh4cOhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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