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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec74af2d5b52582df412464d8305c4cf9806ed2d0c72855448443b29d469fc6' 
  AND token = 'iz1Lk787/lUdVJkjw4VvvI341n9BaYxfPGwTH91cytc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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