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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cab5a563541ac9205c1aadc50738379d32e6e1710a96eb234d3be9c05ced08' 
  AND token = 'qEapJCZqS6oBOKcXrPXHpxIvja5oP0WcB862zM7V/aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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