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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32164fb7e8232071e5cb9457a5b28ea7a97ae9b60fcfe592dca05edfa8ba8b4' 
  AND token = 'EIsBvhqKBe6NyFeoFZmXTNG5vjDcZMLbNKe6oH4zio8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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