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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0353e748cda58ec8249e8955cd085be68812fc8b714fcd425b450e46be31d3f2' 
  AND token = '2RprbC1dcuOFKR+uU+pD6xhuO0Katl4q8EdtQZRoCFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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