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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e23b60bb744993df3ed3f77f5d53e5264a49baa3674c7317041eac51867dcee' 
  AND token = '3YOJV73k3c2Wc3Y5FpmCHIagqkYD6yqhYNyMXbhp8no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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