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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc56edda7ef70aa131c9ad9f77ff43a8d6de9d6322be3867a12bee1d50779e0c' 
  AND token = 'Wgm0tu8Ek2wllDJBfvMVfa6r6s0cL45oQyUiu3q4GsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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