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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfd76e3e9cd320f2dd530cb399a4878f0ca2ed132a8ddfa6f15793aa2c525b3' 
  AND token = 'b/q4y+6gjzjbe7T+Dtpb6unvO+drviqlvZoAABEpOEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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