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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9138076ee1690bfc028c7bd95e3b57f414eaa0bdce19b48b3423c9292a8b376c' 
  AND token = 'PzAD5XWaTGyYzgyFrauwe3CmDH6h+mU+Q+1hT35RRlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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