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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe008088ee09c42915e00728dc400b29e173462d235f6c4851c39611f0c32b7' 
  AND token = 'n75I+h4YehPHuO6FJexEfKJTMUfWeh4T3u1Ugyk10Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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