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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4dbfec5306edf7df698e77b55aeb50b6c47749d5c45ee7a1ab3c2c746163d8' 
  AND token = '4xza/K6Cu8rGlWkGgay8tTXVExA1pbbTACBdRXsWInQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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