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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0086dfc2729a6caabca958165cdfdaffb52300aa2abe4d69fa8eda531fcb2d2d' 
  AND token = '1b4xvEAA0XavpMc7HOZx3FIGVTFtZXJWSkaK60QzA4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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