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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5067c6ccfd47354a7977e813ec5af2dac45ffeb94d887a2345c10f7e823fb9f' 
  AND token = '9SOrj0xWkXEzLAZsRLQaBTHDJKpF298Eei8u1KFPMoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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