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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcfc49331d18675ae8e7656fbf7c194ac2c7b055f74418aa452b560980acb41' 
  AND token = 'YYZrmvaLerMgr5F+Qx8t0ZDqWNMVJVRxEYvjETyzX44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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