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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53150efef4e00b3b83f70957d853feea18d75b0a82883ba9f2e78c148fc0151' 
  AND token = 'RpfguQ8yBRjKgLa6oIQjpuTANumnO50xopjIb4fQeDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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