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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8571a9cd88814b91006c8d6d27037b01388739a1109289e00a62bd37679b85bc' 
  AND token = 'S7gRrEdy8lwbGIdqH2oFUjcALdifgAFjTt/deJeMmcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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