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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb251fc0f230ca62c7fe8d75e9bb9359fae0566a8cee2ec7154bb5d00b3f710' 
  AND token = '506zZTAm6SwRMn9vWd6EBKoUQ3g13SfmvfGTcEJxfis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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