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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a766068bec3d36084abce27b54f2a5a28d8024bc79c85fc54af3722a093b5a59' 
  AND token = 'SQxCBOahjN12ZZYa3b0mHUKpRvSDHRrKL/02qkQi1w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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