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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d98bbe5c4226e77871a8a4c26128629285494183c64d0e84e387aebc7076390' 
  AND token = 'KH8LZuv9Hpp4p3KYQcI5RqEiT6fEW2I810x5qg8+kMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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