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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864c284db077e73b0794af180533bb37a47dcb82c026c1882c18c7de6080940e' 
  AND token = 'DmvIq707aCTjTMWK1PVURCijAXz2rCaNRGbzLXdZJ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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