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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b542f65ea8a5c4d64c00170605d3b3842edb3553eb8fb5ab56f22357a889201b' 
  AND token = 'o/H5F23ytfJ6JWtue7wANcTESjgp5p8iSo2o008b4uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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