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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4cab84743c45e61cf0b337ee530025c6cc8d3d55cb5da6d45c81b9a918c371' 
  AND token = 'oWPAcxlPZvvTsN6Ijr2eWqmlgwv++WGMP1agDGnJ2cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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