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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94b12d7b23f91ce7141e7a035d19b48c05bb4537539796026e5bd33c25bcd5f' 
  AND token = 'LxU82mpycb1yhkkKNQfvz90vm9V3lDr8ffV6sgVfoYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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