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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea4343126fea96f35a2e9afdca6c55245573930267f8c4fec7c238bc0e3fc58' 
  AND token = 'LhpgI91FEGn4yFcnR5Mm+vuyqs7YOSPSo2RZULOnYlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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