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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6b0992ec43ab30534c2279c6392f99bc7d0d7e2f270bf6f737bc73dd950545' 
  AND token = '0dn1QF/I9lDfH09O7KQXeCz39Ql6fQx48kNs/mxKyTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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