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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c319a1aa9c2918a318a74883217ad1fe7478084cb6ecbe9895111f190b45580' 
  AND token = 'ewFPojlnvlf8AhQw1/bSZl9HlVz2ppnudwJ/87jhdNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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