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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150d0492694a1121da159954e0b85ee1d56555b0319a327f55d53f1887586df5' 
  AND token = '510BkXvNe9QK2zhj+zWn+H3hQwAmCT8MCMbDNdoXBqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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