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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211b3b890822c98530044971d45ec170792292c7b2d343c705651c9a5d538ba9' 
  AND token = 'yMWRHsKnbeMyBhO3d6BAM5Ash0eeQGqwZ22IuTBc7vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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