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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cbd2b816dbee28be5abf408f9a7507c44084b2e5af064a3ac685e6becd6564' 
  AND token = '5xoQNJcRSda14nq1c3/mHS+/ajZVznHKsZwLVpw6BPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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