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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0520f7210ddc827e1bc8aaddc86b7dd1d81beb3bc833cda415177d977253b3fa' 
  AND token = '3+1sDfZT9OzUNZT2SPBXhpHdbpzEUrSeOeduUTlnQMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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