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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e314164ad1e8b47d0988557fd8745038fae3af8efcea75ce08251c9cf82643cd' 
  AND token = 'wqSFny8b7YSwoR6d16Or/WMznt3Mu5CB3iBCFlkNx2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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