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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4674c197d70d1efef5982913c2fc814d039219803b41ae2bab8ee2d99ee5f9' 
  AND token = 'aAE+5HMkPL4pTVgacmJ8LvAs1LqFSxQH4Tuqqv+egnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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