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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbc86d4a724d962e82b28e537b3034f7b950c18e660f772f6b421280d4270c0' 
  AND token = 'r7mNNn2sYgd8cl/g19iAxPFNUfPY9ke+Cse//6+LuGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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