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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c169524c1e376c1156fadbbcde4c93ecdf87875ac2c939141ee55637bd8349e' 
  AND token = '7Ter2b3pNpy01mYubyriW+5GBTYW+CVVrmSkLSlbJP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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